Split DownloadItem into an ABC, an Impl, and a Mock.

chrome/browser/safe_browsing/download_protection_service.cc

Index: chrome/browser/safe_browsing/download_protection_service.cc
diff --git a/chrome/browser/safe_browsing/download_protection_service.cc b/chrome/browser/safe_browsing/download_protection_service.cc
index 756716e0dba2443ecf9e5304b3b375dd3f59fb7b..3ae6cb1c14f4965283a5f365c0304b2e6a0cbd93 100644
--- a/chrome/browser/safe_browsing/download_protection_service.cc
+++ b/chrome/browser/safe_browsing/download_protection_service.cc
@@ -117,11 +117,11 @@ DownloadProtectionService::DownloadInfo
 DownloadProtectionService::DownloadInfo::FromDownloadItem(
     const DownloadItem& item) {
   DownloadInfo download_info;
-  download_info.local_file = item.full_path();
-  download_info.download_url_chain = item.url_chain();
-  download_info.referrer_url = item.referrer_url();
+  download_info.local_file = item.GetFullPath();
+  download_info.download_url_chain = item.GetUrlChain();
+  download_info.referrer_url = item.GetReferrerUrl();
   // TODO(bryner): Fill in the hash (we shouldn't compute it again)
-  download_info.total_bytes = item.total_bytes();
+  download_info.total_bytes = item.GetTotalBytes();
   // TODO(bryner): Populate user_initiated
   return download_info;
 }